docs: def initialize_labels(self, labels: Set[str]) -> Tuple[dict, dict]:
          """Create mappings from label to index and index to label"""
          logger.debug("Creating mappings for labels")
  
          label_to_index = {label: index for index, label in enumerate(
                                   ["pad"] + sorted(list(labels)))}
          index_to_label = {index: phn for index, phn in enumerate(
                                   ["pad"] + sorted(list(labels)))}
  
          return label_to_index, index_to_label